| Abbreviation | Definition |
|---|---|
| SHS | slide-hold-slide |
| SHWT | Seasonal High Water Table |
| SIL | South Iceland Lowland |
| SIS | Substratum Intake System |
| SMART | Secant Method For Automatic Rocksim Testing |
| SMBI | Southern Moreton Bay Islands |
| SMO | SAFOD (San Andreas Fault Observatory at Depth) Management Office |
| SMU | Surface Mining Unit |
| SOC | Self Organized Criticality |
| SOG | Southern Ohio Graded |
| SOG | Study and Observations Group |
| SOI | Sand and Oil Interceptor |
| SOI | Survey Of India |
| SOL | Speed Of Light |
| SOS | Standing On Stone |
| SP | South Pacific |
| SP | Spear Point |
| SPCB | Standardised Pure Carbon dioxide Blanket |
| SPE | Slightly Pointed East |
| SPE | Society of Petroleum Engineers |